Examine source code of Markdown Reader

{
  "manifest_version": 3,
  "name": "Markdown Reader",
  "version": "1.0.3",
  "author": "TechSivam Labs",
  "browser_specific_settings": {
    "gecko": {
      "id": "markdown-reader@techsivam.labs",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "description": "Renders local and remote Markdown files beautifully with customizable themes, Table of Contents, and printing support.",
  "permissions": [
    "storage",
    "activeTab"
  ],
  "host_permissions": [
    "http://*/*",
    "https://*/*",
    "file:///*"
  ],
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*",
        "file:///*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "action": {
    "default_title": "Markdown Reader",
    "default_popup": "ui/reader.html"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "ui/reader.html",
        "ui/reader.js",
        "ui/styles.css",
        "vendor/marked.min.js",
        "vendor/purify.min.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}